28787513 has 8 divisors (see below), whose sum is σ = 30110400. Its totient is φ = 27470608.

The previous prime is 28787509. The next prime is 28787519. The reversal of 28787513 is 31578782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28787513 - 2² = 28787509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28787519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10478 + ... + 12936.

It is an arithmetic number, because the mean of its divisors is an integer number (3763800).

Almost surely, 2^28787513 is an apocalyptic number.

28787513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28787513 is a deficient number, since it is larger than the sum of its proper divisors (1322887).

28787513 is a wasteful number, since it uses less digits than its factorization.

28787513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991.

The product of its digits is 94080, while the sum is 41.

The square root of 28787513 is about 5365.3996123308. The cubic root of 28787513 is about 306.4794660631.

The spelling of 28787513 in words is "twenty-eight million, seven hundred eighty-seven thousand, five hundred thirteen".